nine engines shortly after lifting off sunday night. nasa says the rocket still was able to make it into space, though it is unclear what caused that engine to fail in the first place. let's talk about it with tom jones, a former nasa astronaut and the author of "planetology." e guess this thing has nine engines, one failed pretty spectacularly. do we know what it was? >> hi, jon. i think no one really knows the cause yet, but they got good data down from the engines. one of the nine had a pressure loss is what spacex is saying, and apparently it blew debris off the side of the product. on the good news side, the other eight engines continued to win, and the dragon capsule got to orbit. so you like a rocket like this that has the robustness, the ability to withstand failure and still make it to orbit. jon: so i guess, in fact, the payload is being delivered to the international space station just as intended. that's all good news, but is this going to slow down this private space venture? >> well, it'll probably slow it down for a couple of months perhaps before the next launch.